The amount of synergy in wild cards is too damn high I think. Even aggro games go to turn 7 or 8 in standard. But you can die as early as turn 4 with wild. Goblin and Gnomes cards are just way too OP. Secret synergy in Paladin is crazy and the upcoming Giants Warlock stomps the rest out.
It's not the stockpile of cards. I have every relevant card and you simply can't play what "you feel like is good". It has to be the absolute tip top optimised stuff.So a Brawl that forces me to play Wild is a Brawl that essentially boils down to "Here, play with the same cards/decks you always do and get memed on by people who've been playing longer and have a stockpile of obsolete cards".
Fun. /s